Improvement in locks



L am?. ./V P5-549.

All. PINTO-111110. C0. N.Y. (OSBORNE'S PROCESS.)

UNITED STATES PATENT OFFICE.

MARTIN STAOHELIN AND HENRY YOUNG, OF PORT CHESTER, NEV YORK.

IMPROVEMENT IN LOCKS.

Specification forming part of Letters Patent No. 55,549, dated June 12,1566; antedated June 8, 1866.

To all whom t't may concern.'

Be it known that we, MARTIN STACHELIN and HENRY YOUNG, of Port Chester,in the county of Westchester and State of New York, have invented a newand Improved Lock; and we do hereby declare that the following is afull, clear, and exact description thereof', which will enable othersskilled in the art to make and use the same, reference being had to theaccompanying drawings, forming part of this Y specification, in which-Figure l represents an inside elevation of this invention, showing theparts in the posi tion which they assume when fullyl locked. Fig. 2 is atransverse vertical section of the same, the line a; x, Fig. l1,indicating` the plane of section. Fig. 3 is an inside View ot the lockwhen the bolt is unlocked and the nightlatch or supplementary boltthrown forward or locked.

Similar letters ot' reference indicate like parts.

This invention relates to a lock with two bolts, one of which takes theplace of the ordinary bolt and the other that ot' the nightlatch orlatch operated by means of handles. Both bolts arc subject to the actionot' one and the saine key, which acts on the main bolt in the ordinary1n aimer, and on thelatch by means of a swinging frame, which issuspended from a pivot attached to the main bolt, and which is providedwith an oblong slot that catches over a stud projecting from the shankof the latch. This frame is placed in such a position that when the bitof the key acts on the main bolt it turns between said frame and thefront plate ofthe lock, and it is provided with lugs or projections, onwhich the bitot' the key operates when it is desired to move the latch.Said bit, however, is so narrow that it turns on either side ot' theswinging frame, and the lock is so constructed that it can'be operatedonly by a person acquainted with its construction.

A represents the case of our lock, which is constructed of cast-iron,sheet metal, or any other suitable material, in the ordinary or anyother desirable form or shape. This case contains the working parts ofour lock, which consist chieliy of two bolts, B O, one of which takesthe place of the ordinary shot-bolt, whereas the other takes the placeot' the ni ghtlatch, or of an ordinary door-latch, the former beingoperated solely by the key D, and the latter by the key `and valso by asuitable th umh-piece or handle it' desired.

The shot-bolt B is constructed in the ordinary manner, with a notch, a,to admit the bit of the key, and with a tumbler, b, which arrests itafter it has been thrown forward or backward, and the bit ofthe key isot' such a shape that it acts upon said shot-bolt when the key isinserted into the lock, so that :its bit turns close-011 the innersurface of the front plate of the case A.

The shot-bolt B connects with the latch C by means ot' a swinging frame,E, which is suspended -t'rom a pin, g, that is secured in the shank ofthe shot-bolt and which is furnished with an oblon g slot, c, thatcatches over a stud, d, fastened in the shank ot the latch. This frameis so situated that the bit of the key turns on either side of thesame-that is to say, between it and the front plate of the case andbetween it and the back plate of the lockand it is provided with twolugs or ears, ef, which are in such a position that the bit of the keycomes in contact with them when it is made to rotate between said frameand the front plate otl the case A. It'l the key is turned so that itsbit strikes the lug c, the latch C is thrown forward, and by turning thekey in the opposite direction it strikes the lug f and carries the latchwholly or partially back. It carries the saine clear back it theshot-bolt is thrown forward but if said bolt is back, the latch is onlypartially moved back and the door is not opened.

In order to open a door to which our lock is attached, it is necessaryafter inserting the key to turn the bit slightly toward the heads ofthebolts, causing it to drop between the lugs c f, and by turning said keyback the latch is drawn in or unlocked. The bit ot' the key has now tobe raised above the frame E and turned forward a quarter of arevolution, when it comes opposite a notch, h, in the frame, whichpermits the same to drop down to the inner surface of the front plate ofthe case,

and by continuing to turn the key at'ter it has dropped down through thenotch in the frame the shot-bolt is withdrawn or unlocked. In order towithdraw the key without locking the latch it has to be turned until itsbit comes under one ofthe notches, t' or j, in the swinging frame, andthen it must be raised before it can be turned so as to bring;` the bitopposite the key-hole. It' this precautionis not taken, and the key isturned in the direction of the arrow marked near it in Fig. 3 nutilitcomes in contact with the stud e, the latch Will be thrown forward, andit' the key is then turned back until the bit cornes opposite thekey-hole the latch will be carried in only half-way, and the door cannotbe opened. A person not aoquainted with the lock will have considerabledifficulty in unlocking the same.

It is obvious that our lock can be easily so arranged that the key canbe inserted from either side and the latch can be operated by a

